The White House doctor says President Trump is now undergoing treatment for Covid-19 after he and his wife tested positive for the virus.
The President's opponent in this November's election, Joe Biden, says he's sending prayers for the health and safety of the President and the First Lady.
At least three more cases of Covid-19 have been reported at the White House - two of them reporters who cover the Presidency, the third a member of White House staff.
Our Washington Correspondent Simon Marks reports.
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